#include<stdio.h>
int main(){
    int score;
    printf("Enter the student's score: ");
    sacnf("%d", &score);
    if(score<0){
        printf("Invalid Input\n");
    }else if(score >= 50){
        printf("PASS\n");
    }else {
        printf("FAIL\n");
    }
    return 0;
}